Abstract
Flows around a circular cylinder in elliptical orbital flows have been computed using the random vortex method for situations where the flow is attached and laminar; the Keulegan-Carpenter number is less than or equal to 1·5. The forces are related to the flow characteristics and steady streaming is shown to have a significant influence for ellipticity even as low as 1 8, depending on the Keulegan-Carpenter number. The interdependence of horizontal and vertical inertia coefficients and of horizontal and vertical drag coefficients on ellipticity may be modelled simply for certain ranges of Keulegan-Carpenter number and ellipticity. Force components at frequencies other than the orbital frequency can occur and cause scatter in values of drag coefficient in successive half cycles for the higher Keulegan-Carpenter numbers investigated; this does not occur in the linear oscillatory case (zero ellipticity). Previous experience suggests that there will be qualitatively similar effects at very high, full-scale Reynolds numbers with turbulent flow. © 1993.
| Original language | English |
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| Pages (from-to) | 281-292 |
| Number of pages | 11 |
| Journal | Applied Ocean Research |
| Volume | 15 |
| Issue number | 5 |
| Publication status | Published - 1993 |